I have cycled my tank and all the levels were good I added 2 albino Corydoras yesterday and today I have these white things growing they look like the white fluffy things on dandelions and there also was what looked like a white worm sort of thing very tiny moving on my glass, my betta is due to arrive on Friday and I want to cancel the delivery if needs to be treatment what is this stuff it's on the glass and the rocks! It's a 27L tanks with rocks no plants atm as they died and we're taken out! I will try add some pictures I took. Also just seen a snail in the corner of the tank!!